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1.Select any kind of project. 2.Invoke Properties in the context menu of the project 3. "Invalid preference page path: UseCase Diagram" in the console When on choses UseCase diagram PropertysPages and selects "Appearance" page then there is another exception: java.lang.ClassCastException: org.eclipse.papyrus.diagram.usecase.preferences.DiagramAppearancePreferencePage cannot be cast to org.eclipse.ui.IWorkbenchPropertyPage at org.eclipse.ui.internal.dialogs.RegistryPageContributor.createPage(RegistryPageContributor.java:120) ... No other Papyrus diagram has its own PropertyPage now but UseCase diagram. This functionality looks obsolete.
This bug originally came from Bug 317961 [General] Invalid preference page path
Created attachment 173460 [details] Patch
Thank you Tatiana for the patch. I applied it.